Enhancement of Condensation Heat Transfer Using an Electric Field : 2nd Report, Model Analysis on Heat Transfer Enhancement Using a Bare Wire Electrode

Abstract

A model experiment was conducted to investigate the dynamic behavior of a liquid sheet under an electric field applied parallel to the flow direction. It was confirmed that the liquid sheet was changed into columns when the applied voltage exceeded a certain critical value. Then a model analysis based on a linear stability theory was carried out to predict the critical applied voltage and it was shown that the analytical results were in good agreemnt with the measured values. Further, based on the above-mentioned model describing the dynamic behavior of the liquid sheet, an analytical model predictiong the EHD effect on condensation heat transfer for a finned tube was presented. It was shown that the predicted results were in good agreement with the experimental data on the flooding angle and condensation heat transfer coefficient for a finned tube under electric fields.